单项选择题
Most medium and slow speed diesels are started by what medium?（）
A.Electric starting motors
B.Hydraulics
C.Compressed air
D.Ether
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相关考题
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Many sheath-screw davits have markings to indicate the maximum angle to which they should be cranked out. If the angle is exceeded，the davit（）.
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B.will not automatically position the boat at the embarkation station
C.screw may come out of the sheath
D.will chafe against the falls and may cause their failure -
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Maintaining the close tolerances in diesel fuel pumps and injectors requires the use of（）.
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B.a sample rubbed between fingers feels thin
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D.it no longer supports combustion
